Oil-well pump



March 30 1926.

E. DERBY oIL WELL PUMP Filed sept. a, 1925 afl Jhr/anion (h'l Hand-1,

Patented Mar. 30, 1926.

UNITEDl s'rATi-:s`

EARLE DERBY, 0F SAN FRANCISCO, CALIFORNIA.

OIL-WELL PUMP.

Application led September 8,1925. Serial No. 54,888.

To all whom it may' concern: I

Be it lmown that llAnrln Daum', a citizen of the United States, residing at the city and county of San Francisco, and State ofV California, have invented certain new and useful Inun'ovements in (')il-l/Vell Pumps, of which the following is a specification.

My invention relates to the class ot oilwell pumps, and particularly to a pump which, in view of its functions and the objects attained may with propriety be termed a semigas-lift and gas and oil separating pump.

In the usualmethods of oil-well pumping, the pump is placed somewhere below the liquid level in the well andis connected to an actuating mechanism at the ground surface by a long string ot' rods.

Gas is present' in all forn'iations containing oil, the gas being in varying amounts and at various pressures depending on the nature of the oil, the type of formations, and the length of time that the formation has been produced from.

A Well is usually a flowing producer, due to the pressure of the gas, and it is desirable to conserve this gas and make it do all' the Work possible in lifting the oil to the ground surface.

The object of my invention is two-fold ziirst, to take advantage of the remaining gas pressure after a well has ceased to flow, to lift the oil as far as it will; and, second,

to automatically separate this gas from the o il at the end of this gas lift, pumping only the oil through the tubing, thus eliminating difficulties now experienced when pumps are .gas locked and stop pumping.

With these ends in view, my invention consists inthe novel pumping apparatus which I shall hereinafter fully describe in connection with the accompanying drawings in which l have illustrated a typical form of a preferred embodiment vof my invention, it bemg understood that changes in form, proportion, and arrangement may be made without departing from the spirit ofthe invention as defined by the claims hereunto appended.

In the accompanying drawings,

Fig l1 is a vertical section, broken, of my oil-Well pump. y

Fig. 2 is a lsection enlarged of the upper portion of Fig. l, showing the gas outlets controlled ,by check valves..

1 is a standard oil-well pump of any anism.

klok.

malxe or description, placed at the end of tubing 2 and connected to the surface by rods 3 in the usual manner. 4 is the well casing.l Around and concentric with the pump are the, pipes?) and 3. The pipe 5 is closed at the bottom and yperforated at points higher up designated by 7 and 8.

The pipe 6 is open at the bottom andl is directly connected to the tubing 9. At or near its iop, as shown at vit is perforated.

A check valve 10 is located in the tubing 9, just below the entrance to the pipe 6.

The tubing 9 extends downward in the casing and into the liquid, the level of which is indicated in Fig. 1 by the inscription Liquid level.

At a point above the liquid level is placed 'a packer 11 between the tubing 9 and the The operation is as follows:-

Oil and gas produced from the formation passinto the easing Ltand are constrained to pass up through the tubing 9 by the packer 11, said tubing having been'made G into the well casing, through the perforation 6 near the top. The oil, however, at the upper limit of its rise due to the gas pressure, drops through the perforations 7 to the bottom of the pipe 5 from which by the pump 1 it is raised to the surface. Any gas that may ,enter with the oil through the perforations 7 is discharged through. the perforations 8., It will thus be seen that the oil pumped has been separated from the gas, thus eliminating troublesome gasl locks in the pump. The advantages of this pump may be enumerated as follows:- Pumping energy required is minimized. The length of pum ing rods is reduced, makinga' cheaper an better working mech- The gas ow is restricted to the amount of gas used to lift the oil. The oil and gas are separated at low pressures, making the separation more effective.V On account ofthe effective separation of oil and gas, the pump has less tendency to gas In Fig. 1, I have shown theperforations 'pipe 6 into the casing 4 as free and-kunchecked.- Under certain conditions, how`- ever, it is desirable to cheek them, such elaboration being shown in Fig. 2. In this case the perforations 6 are placed'in the head of pipe 6, and are tted with check valves.

The purpose of these check Valves'is to prevent the gas froin returning from the Well casing? pump. T

into the pipe 6 and thence to the iis check Acontrol of the perforations 6 will tend to correct a condition Where a well flows intermittently -to the pumping point.

As. the pump operates` continuously, .I it

` would, in the absence of oil, pump gas. But

i A, trance tube extending if the return of the gas `from vthe well casing' is prevented, the tendency is to create a suction at thevalve 10, thereby aiding the How.

1.' An oil-well pump comprising an entrance' tube extending below-the oil level in the well; a packer in the well above said oil level closing the well around the entrance tube; a check Valvel in said'entrance' tube; a

pipe communicating at itslov'ver end with thel upper end of the entrance/tube, saidh'pipe communicating above With-the well; a secondv pipe within and spaced. from the first' lnamed. pipe, said inner pipe having a closed lower endand communicating above with the outer pipe; and a Ypumping instrumen-l tality within thev inner pipe.

- 2. An oil-well pum comprising an enlow the oil. level'in the well; a packer in the well above said oil level closing` the Well around'the entrancev tube; a cheek valve i-n said entrancetube; a pipe. communicating at itslower endwith the upper endofthe entrance tube,` said check valve contro ing said latter communifromthe first name pipe, said inner pipe having@ closed lower end and communieating above with the outer pipe; and a pumping instrumentality Withm' the inner p1 e. .f u

il. An oil-well urn comprising an entrance 'tubeextenriing below the oil -level inl the well; a packer in the well above said ,oil level closing the well around -,the entrance tube; a check Valve in said entrance tube; a pipe communicating at its lower end with the upper end of the entrance tube, said pipe communicating above with the well; a second pipe Within and spaced from the first named pipe, said inner pipe having a closed lower end and communicating with the outer pipe at separated places onev at its upper .end and the other intermediate its ends ;l and a pumpinginstrumentality within the inner 4. An oil-well pump comprising an lcn` trance tubeextendng below the oil level in the well; a packer in the well above said oil 6 by which .the separated gais passes from pipe communicatin above with the well; :t I

level closing the well around the entrance tube; a check valve in said entrance tube; a pipe communicating at its lower end with theupper'end of the entrancetube, Said pipe communicating above with the well; a check valve controllmg said latter communication;

a second-pipe within and spaced from the first named pipe, said inner pipe having a lclosed lower end and communicatingwith the outer pipe at separated places one at its upper. end, and ,the other vintermediate its ends; and a pumping instrumentality within the inner pipe. j

In testimony whereof Iy have signed my name to this specification. v EARLE DERBY. 

